A 13-year-old boy in Oklahoma accused of fatally shooting his 10-year-old friend with a crossbow has been charged as an adult with first-degree murder.

Austin Almanza was struck near the stomach by an arrow, which traveled through his body and then wounded his 8-year-old brother in the arm.

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The teen, identified by the Oklahoman as Shane Edward Brooks, is one of the youngest ever in the state to be charged as an adult with the top murder charge. A judge on Thursday ordered a psychological evaluation for Brooks to determine how his case should go forward.

The tragic incident took place on Oct. 21 in the small town of Chandler, about 40 miles northeast of Oklahoma City.

The 8-year-old child told investigators that he and his brother were working on a treehouse with Brooks, who became angry when they tried to leave.

Brooks told authorities that "he was hunting and accidentally shot his friends," according to the Oklahoman. However, the 8-year-old boy said the suspect "was mad at them," according to the newspaper.

Their uncle told investigators he "heard screaming" and saw the little brother with the arrow in his arm, according to the Oklahoman.

Austin Almanza passed away on Oct. 21 after being struck by an arrow. (Kendra Renee Barton/Facebook)

Brooks, dressed in camouflage, was heard saying "I think I murdered him accidentally," according to an affidavit obtained by the Oklahoman. The teen suspect then "ran home crying."

The child obtained the crossbow the day before, his stepfather told authorities.

"Brooks has a good temperament but had a hatred of his mother," the stepfather said, according to the paper. The teen had struck his mother, but "no action was ever taken," the stepdad said.

The teen owned a shotgun, a rifle, pistols and a BB gun, the 8-year-old brother of the victim told investigators, according to the newspaper.

The teen was released on $130,000 bail. There can be no weapons in his home and he must have GPS monitoring, and he cannot have contact with Austin's family.